Definitions

1. noun

A type of rodent, particularly a member of the subfamily Sigmodontinae, which includes mice, rats, and other small rodents.

“The team of scientists studied the behavior of sigmodonts in the South American rainforest.”

2. adjective

Relating to or denoting the subfamily Sigmodontinae of rodents.

“The new species of sigmodont was discovered in the remote region of the Andes.”